Packing-ring.



B.'B. CAMPBELL.

PACKING RING. 'j APPLIOATION FILED MAR. 2s, 1912.

Mmmm f Patented Aug. 6, 1912.

' UNXTED s'inriisI PATENT onrioii."

EDWARD B. CAMPBELL, OF ST. LOUIS, MISSOURI, ASSIG-NOR 0F ONE-HALF T0 AMBRO J'. NORTHCR-AFT, 0F ST. LOUIS, MISSOURI.

PACKING-RING.

Specification of Letters Patent.

Appiicanon sied March 2e, 1912. serial Naesasoi.

Patented Aug. 6, 1912.

Y packing rings tor pistons, andthe object of my invention is to construct a packing which consists of three metallic, elastic, open rings, the openings being separated from each other so as to break joints, and arrange two of the rings upon a larger base ring so that when the rings are placed in position upon Ythe piston they will evpand to bear uniformlv against the entire inner periphery of the cylinder.

With the .above purposes in view my in' vention consists in certain novel features of construction and arrangementot parts as Will be hereinafter more fully described, pointed out in the claims and illustrated by the accompanying drawings, in which- Figure 1 shows a pist-on carrying a number ofv my improved packing rings; Fig. 2

is a sectional view of the assembled rings;

Fig. 3 is an edge view of one of the outer rings showing the opening therein; Fig. 4 is an edge view of the other outer ring; Fig. 5

is an elevation of the assembled rings showing a portion of one ot' the outer rings broken away and` a portion of the inner or base ring in section; and Fig. 6 is an enlarged, sectional, detail View taken on the .line 6 6 of Fig. 5.

Referring by numerals to the accompanying drawings: 1 designates an ordinary cylinder, 2 an ordinary piston provided with the annular channels 3.

4 designates the piston rod which is connected with the piston by means of the pin 5.

All of the parts just described are of ordinary construction, and form no part of my invention.

-6 designates the base ring of my improved packing, `which may be formed by cutting a section from a cylinder, .the Width of the section beingequal to the Width of the channel 3 which the 'ring is designed toltill. Before the annular groove 7 is to periphery of the ring. After the groove has been formed a diagonal sect-ion is removed to `form the angular ends 8-8, thereby forming an open ring .The open ring is then placed upon a `drill and an opening 9 is torrned through the ring within the groove 7 about di'ametrically oiposite the angular of which is preferwidths of th'e\rings 12 and 13 are equal tothe width of the base ring 6. The rings 12 and 13 are formed, as is the ring 6, by cutting sections otithe desired length from a cylinder. cut a portion of their inner faces is removed to produce the annular flanges 14. These flanges 14 are located at the abutting faces of the rings 12 and 13 and the combined widths of the flanges are equal to the width of the groove 7. vln each ot' the rings 12 and 13 there is a diagonal sectionremoved to 'form the angular ends 15 in the ring 12 and angular ends 16 in the ring'13;

The inside diameter of the rin 6 is is designed to re.

across the groove 7.

Before these sections have beenf so r slightly in excess of the diameter of t e piss.

ton taken at a point. through one'of the channels 3 so that when the ring 6 is placed in the groove, l ing its ends together, and held by the outer rings 19. and 13, the s'aid ring 6 will have a tendency at all times to force the rings l2 and 13 against the inner periphery of the engine cylinder.

Each ot' the rings 12 and 13 has a diam# eter slightly in excess of the diameter of the piston proper, and when in one of the channels 3 over the base ring G and compressed by bringing its ends together, each of the rings will have a tendency to bear outwardly against the innerf periphery of the engine cylinder.

compressed slightly by draW- placed in position lVhen the rings are assembled the diagtions embracing the key serve to prevent a These cut away porv 6 to'it 'the engine cylinder.

ifa

relative rotary movement 'of al1 of the rings, so that at'A al1 times the openings in the rings will be held in positions to break ioints.'`

When all of the rings are placed in the piston', andthe piston placed in position in 4the cylinder, and in the event the piston does not fit perfectly within the cylinder, .the rings 12 and 13 will 'expand at their open ends to approximately fit the engine cylin-l der. The balance of the rings, that is the portions 'of-the rings removed from their openings,'will be expanded by the base ring It will 'thus be seen ,that -I obtain what may be termed ,a three point expansion packing ring.

I 'am aware that heretofore packlng rings have been made of a number of parts, two

being a common number,4 opening aty diametrically opposite points. These rings were `open as are my rings and compressed to tit 1n the grooves in the piston, but in view ofthe fact that the compression o f a circular ring distorted each ring,the combined'rings formed a distortedcircle which couldnot-,possibly accurately fit the entire -inner periphery of the engine cylinder.

These rings, in a number of cases, overlapped each other, but due to their distortion this overlapping would not prevent leakage through the piston.

The 'flanges 14 of the outer rings and the groove in the inner rings form a joint which prevents leakage, due to the fact that the outer rings and' the inner ring are vbroken atpoints of equal separation.

I claim:

1. A packing for pistons having angular grooves, comprising a resilient, open base ring having a groove in its outer periphery, a pair of outer rings each of which is an open ring and constructed of resilient material, and. arranged to embrace the base ring, a flange on Veach of the outer rings arranged to t the groove in the base ring, in order to form a steam-tight joint between all of the rings, and whereby all of the rings may be moved diametrically relative to each other. i

2. A packing for pistons having angular ring, a flange on each of the outer rings arranged to lit the groove in the base ring,

coinciding portions of said flanges being removed to form key-ways, and a key carriedby the base ring forengagement in said key- Ways to prevent relative rotary movement.

of all of the rings.

In testimony whereof, I have signed my name to this speciiication, in presence of two subscribing witnesses.

EDWARD B. CAMPBELL.

Witnesses;

E. L. WALLACE, N. G. BUTLER. 

